| 1 | /* av.c |
| 2 | * |
| 3 | * Copyright (c) 1991-2000, Larry Wall |
| 4 | * |
| 5 | * You may distribute under the terms of either the GNU General Public |
| 6 | * License or the Artistic License, as specified in the README file. |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * "...for the Entwives desired order, and plenty, and peace (by which they |
| 12 | * meant that things should remain where they had set them)." --Treebeard |
| 13 | */ |
| 14 | |
| 15 | #include "EXTERN.h" |
| 16 | #define PERL_IN_AV_C |
| 17 | #include "perl.h" |
| 18 | |
| 19 | void |
| 20 | Perl_av_reify(pTHX_ AV *av) |
| 21 | { |
| 22 | I32 key; |
| 23 | SV* sv; |
| 24 | |
| 25 | if (AvREAL(av)) |
| 26 | return; |
| 27 | #ifdef DEBUGGING |
| 28 | if (SvTIED_mg((SV*)av, 'P') && ckWARN_d(WARN_DEBUGGING)) |
| 29 | Perl_warner(aTHX_ WARN_DEBUGGING, "av_reify called on tied array"); |
| 30 | #endif |
| 31 | key = AvMAX(av) + 1; |
| 32 | while (key > AvFILLp(av) + 1) |
| 33 | AvARRAY(av)[--key] = &PL_sv_undef; |
| 34 | while (key) { |
| 35 | sv = AvARRAY(av)[--key]; |
| 36 | assert(sv); |
| 37 | if (sv != &PL_sv_undef) { |
| 38 | dTHR; |
| 39 | (void)SvREFCNT_inc(sv); |
| 40 | } |
| 41 | } |
| 42 | key = AvARRAY(av) - AvALLOC(av); |
| 43 | while (key) |
| 44 | AvALLOC(av)[--key] = &PL_sv_undef; |
| 45 | AvREIFY_off(av); |
| 46 | AvREAL_on(av); |
| 47 | } |
| 48 | |
| 49 | /* |
| 50 | =for apidoc av_extend |
| 51 | |
| 52 | Pre-extend an array. The C<key> is the index to which the array should be |
| 53 | extended. |
| 54 | |
| 55 | =cut |
| 56 | */ |
| 57 | |
| 58 | void |
| 59 | Perl_av_extend(pTHX_ AV *av, I32 key) |
| 60 | { |
| 61 | dTHR; /* only necessary if we have to extend stack */ |
| 62 | MAGIC *mg; |
| 63 | if ((mg = SvTIED_mg((SV*)av, 'P'))) { |
| 64 | dSP; |
| 65 | ENTER; |
| 66 | SAVETMPS; |
| 67 | PUSHSTACKi(PERLSI_MAGIC); |
| 68 | PUSHMARK(SP); |
| 69 | EXTEND(SP,2); |
| 70 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 71 | PUSHs(sv_2mortal(newSViv(key+1))); |
| 72 | PUTBACK; |
| 73 | call_method("EXTEND", G_SCALAR|G_DISCARD); |
| 74 | POPSTACK; |
| 75 | FREETMPS; |
| 76 | LEAVE; |
| 77 | return; |
| 78 | } |
| 79 | if (key > AvMAX(av)) { |
| 80 | SV** ary; |
| 81 | I32 tmp; |
| 82 | I32 newmax; |
| 83 | |
| 84 | if (AvALLOC(av) != AvARRAY(av)) { |
| 85 | ary = AvALLOC(av) + AvFILLp(av) + 1; |
| 86 | tmp = AvARRAY(av) - AvALLOC(av); |
| 87 | Move(AvARRAY(av), AvALLOC(av), AvFILLp(av)+1, SV*); |
| 88 | AvMAX(av) += tmp; |
| 89 | SvPVX(av) = (char*)AvALLOC(av); |
| 90 | if (AvREAL(av)) { |
| 91 | while (tmp) |
| 92 | ary[--tmp] = &PL_sv_undef; |
| 93 | } |
| 94 | |
| 95 | if (key > AvMAX(av) - 10) { |
| 96 | newmax = key + AvMAX(av); |
| 97 | goto resize; |
| 98 | } |
| 99 | } |
| 100 | else { |
| 101 | if (AvALLOC(av)) { |
| 102 | #ifndef STRANGE_MALLOC |
| 103 | MEM_SIZE bytes; |
| 104 | IV itmp; |
| 105 | #endif |
| 106 | |
| 107 | #if defined(MYMALLOC) && !defined(LEAKTEST) |
| 108 | newmax = malloced_size((void*)AvALLOC(av))/sizeof(SV*) - 1; |
| 109 | |
| 110 | if (key <= newmax) |
| 111 | goto resized; |
| 112 | #endif |
| 113 | newmax = key + AvMAX(av) / 5; |
| 114 | resize: |
| 115 | #if defined(STRANGE_MALLOC) || defined(MYMALLOC) |
| 116 | Renew(AvALLOC(av),newmax+1, SV*); |
| 117 | #else |
| 118 | bytes = (newmax + 1) * sizeof(SV*); |
| 119 | #define MALLOC_OVERHEAD 16 |
| 120 | itmp = MALLOC_OVERHEAD; |
| 121 | while (itmp - MALLOC_OVERHEAD < bytes) |
| 122 | itmp += itmp; |
| 123 | itmp -= MALLOC_OVERHEAD; |
| 124 | itmp /= sizeof(SV*); |
| 125 | assert(itmp > newmax); |
| 126 | newmax = itmp - 1; |
| 127 | assert(newmax >= AvMAX(av)); |
| 128 | New(2,ary, newmax+1, SV*); |
| 129 | Copy(AvALLOC(av), ary, AvMAX(av)+1, SV*); |
| 130 | if (AvMAX(av) > 64) |
| 131 | offer_nice_chunk(AvALLOC(av), (AvMAX(av)+1) * sizeof(SV*)); |
| 132 | else |
| 133 | Safefree(AvALLOC(av)); |
| 134 | AvALLOC(av) = ary; |
| 135 | #endif |
| 136 | resized: |
| 137 | ary = AvALLOC(av) + AvMAX(av) + 1; |
| 138 | tmp = newmax - AvMAX(av); |
| 139 | if (av == PL_curstack) { /* Oops, grew stack (via av_store()?) */ |
| 140 | PL_stack_sp = AvALLOC(av) + (PL_stack_sp - PL_stack_base); |
| 141 | PL_stack_base = AvALLOC(av); |
| 142 | PL_stack_max = PL_stack_base + newmax; |
| 143 | } |
| 144 | } |
| 145 | else { |
| 146 | newmax = key < 3 ? 3 : key; |
| 147 | New(2,AvALLOC(av), newmax+1, SV*); |
| 148 | ary = AvALLOC(av) + 1; |
| 149 | tmp = newmax; |
| 150 | AvALLOC(av)[0] = &PL_sv_undef; /* For the stacks */ |
| 151 | } |
| 152 | if (AvREAL(av)) { |
| 153 | while (tmp) |
| 154 | ary[--tmp] = &PL_sv_undef; |
| 155 | } |
| 156 | |
| 157 | SvPVX(av) = (char*)AvALLOC(av); |
| 158 | AvMAX(av) = newmax; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | =for apidoc av_fetch |
| 165 | |
| 166 | Returns the SV at the specified index in the array. The C<key> is the |
| 167 | index. If C<lval> is set then the fetch will be part of a store. Check |
| 168 | that the return value is non-null before dereferencing it to a C<SV*>. |
| 169 | |
| 170 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for |
| 171 | more information on how to use this function on tied arrays. |
| 172 | |
| 173 | =cut |
| 174 | */ |
| 175 | |
| 176 | SV** |
| 177 | Perl_av_fetch(pTHX_ register AV *av, I32 key, I32 lval) |
| 178 | { |
| 179 | SV *sv; |
| 180 | |
| 181 | if (!av) |
| 182 | return 0; |
| 183 | |
| 184 | if (key < 0) { |
| 185 | key += AvFILL(av) + 1; |
| 186 | if (key < 0) |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | if (SvRMAGICAL(av)) { |
| 191 | if (mg_find((SV*)av,'P') || mg_find((SV*)av,'D')) { |
| 192 | dTHR; |
| 193 | sv = sv_newmortal(); |
| 194 | mg_copy((SV*)av, sv, 0, key); |
| 195 | PL_av_fetch_sv = sv; |
| 196 | return &PL_av_fetch_sv; |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | if (key > AvFILLp(av)) { |
| 201 | if (!lval) |
| 202 | return 0; |
| 203 | sv = NEWSV(5,0); |
| 204 | return av_store(av,key,sv); |
| 205 | } |
| 206 | if (AvARRAY(av)[key] == &PL_sv_undef) { |
| 207 | emptyness: |
| 208 | if (lval) { |
| 209 | sv = NEWSV(6,0); |
| 210 | return av_store(av,key,sv); |
| 211 | } |
| 212 | return 0; |
| 213 | } |
| 214 | else if (AvREIFY(av) |
| 215 | && (!AvARRAY(av)[key] /* eg. @_ could have freed elts */ |
| 216 | || SvTYPE(AvARRAY(av)[key]) == SVTYPEMASK)) { |
| 217 | AvARRAY(av)[key] = &PL_sv_undef; /* 1/2 reify */ |
| 218 | goto emptyness; |
| 219 | } |
| 220 | return &AvARRAY(av)[key]; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | =for apidoc av_store |
| 225 | |
| 226 | Stores an SV in an array. The array index is specified as C<key>. The |
| 227 | return value will be NULL if the operation failed or if the value did not |
| 228 | need to be actually stored within the array (as in the case of tied |
| 229 | arrays). Otherwise it can be dereferenced to get the original C<SV*>. Note |
| 230 | that the caller is responsible for suitably incrementing the reference |
| 231 | count of C<val> before the call, and decrementing it if the function |
| 232 | returned NULL. |
| 233 | |
| 234 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for |
| 235 | more information on how to use this function on tied arrays. |
| 236 | |
| 237 | =cut |
| 238 | */ |
| 239 | |
| 240 | SV** |
| 241 | Perl_av_store(pTHX_ register AV *av, I32 key, SV *val) |
| 242 | { |
| 243 | SV** ary; |
| 244 | |
| 245 | if (!av) |
| 246 | return 0; |
| 247 | if (!val) |
| 248 | val = &PL_sv_undef; |
| 249 | |
| 250 | if (key < 0) { |
| 251 | key += AvFILL(av) + 1; |
| 252 | if (key < 0) |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | if (SvREADONLY(av) && key >= AvFILL(av)) |
| 257 | Perl_croak(aTHX_ PL_no_modify); |
| 258 | |
| 259 | if (SvRMAGICAL(av)) { |
| 260 | if (mg_find((SV*)av,'P')) { |
| 261 | if (val != &PL_sv_undef) { |
| 262 | mg_copy((SV*)av, val, 0, key); |
| 263 | } |
| 264 | return 0; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | if (!AvREAL(av) && AvREIFY(av)) |
| 269 | av_reify(av); |
| 270 | if (key > AvMAX(av)) |
| 271 | av_extend(av,key); |
| 272 | ary = AvARRAY(av); |
| 273 | if (AvFILLp(av) < key) { |
| 274 | if (!AvREAL(av)) { |
| 275 | dTHR; |
| 276 | if (av == PL_curstack && key > PL_stack_sp - PL_stack_base) |
| 277 | PL_stack_sp = PL_stack_base + key; /* XPUSH in disguise */ |
| 278 | do |
| 279 | ary[++AvFILLp(av)] = &PL_sv_undef; |
| 280 | while (AvFILLp(av) < key); |
| 281 | } |
| 282 | AvFILLp(av) = key; |
| 283 | } |
| 284 | else if (AvREAL(av)) |
| 285 | SvREFCNT_dec(ary[key]); |
| 286 | ary[key] = val; |
| 287 | if (SvSMAGICAL(av)) { |
| 288 | if (val != &PL_sv_undef) { |
| 289 | MAGIC* mg = SvMAGIC(av); |
| 290 | sv_magic(val, (SV*)av, toLOWER(mg->mg_type), 0, key); |
| 291 | } |
| 292 | mg_set((SV*)av); |
| 293 | } |
| 294 | return &ary[key]; |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | =for apidoc newAV |
| 299 | |
| 300 | Creates a new AV. The reference count is set to 1. |
| 301 | |
| 302 | =cut |
| 303 | */ |
| 304 | |
| 305 | AV * |
| 306 | Perl_newAV(pTHX) |
| 307 | { |
| 308 | register AV *av; |
| 309 | |
| 310 | av = (AV*)NEWSV(3,0); |
| 311 | sv_upgrade((SV *)av, SVt_PVAV); |
| 312 | AvREAL_on(av); |
| 313 | AvALLOC(av) = 0; |
| 314 | SvPVX(av) = 0; |
| 315 | AvMAX(av) = AvFILLp(av) = -1; |
| 316 | return av; |
| 317 | } |
| 318 | |
| 319 | /* |
| 320 | =for apidoc av_make |
| 321 | |
| 322 | Creates a new AV and populates it with a list of SVs. The SVs are copied |
| 323 | into the array, so they may be freed after the call to av_make. The new AV |
| 324 | will have a reference count of 1. |
| 325 | |
| 326 | =cut |
| 327 | */ |
| 328 | |
| 329 | AV * |
| 330 | Perl_av_make(pTHX_ register I32 size, register SV **strp) |
| 331 | { |
| 332 | register AV *av; |
| 333 | register I32 i; |
| 334 | register SV** ary; |
| 335 | |
| 336 | av = (AV*)NEWSV(8,0); |
| 337 | sv_upgrade((SV *) av,SVt_PVAV); |
| 338 | AvFLAGS(av) = AVf_REAL; |
| 339 | if (size) { /* `defined' was returning undef for size==0 anyway. */ |
| 340 | New(4,ary,size,SV*); |
| 341 | AvALLOC(av) = ary; |
| 342 | SvPVX(av) = (char*)ary; |
| 343 | AvFILLp(av) = size - 1; |
| 344 | AvMAX(av) = size - 1; |
| 345 | for (i = 0; i < size; i++) { |
| 346 | assert (*strp); |
| 347 | ary[i] = NEWSV(7,0); |
| 348 | sv_setsv(ary[i], *strp); |
| 349 | strp++; |
| 350 | } |
| 351 | } |
| 352 | return av; |
| 353 | } |
| 354 | |
| 355 | AV * |
| 356 | Perl_av_fake(pTHX_ register I32 size, register SV **strp) |
| 357 | { |
| 358 | register AV *av; |
| 359 | register SV** ary; |
| 360 | |
| 361 | av = (AV*)NEWSV(9,0); |
| 362 | sv_upgrade((SV *)av, SVt_PVAV); |
| 363 | New(4,ary,size+1,SV*); |
| 364 | AvALLOC(av) = ary; |
| 365 | Copy(strp,ary,size,SV*); |
| 366 | AvFLAGS(av) = AVf_REIFY; |
| 367 | SvPVX(av) = (char*)ary; |
| 368 | AvFILLp(av) = size - 1; |
| 369 | AvMAX(av) = size - 1; |
| 370 | while (size--) { |
| 371 | assert (*strp); |
| 372 | SvTEMP_off(*strp); |
| 373 | strp++; |
| 374 | } |
| 375 | return av; |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | =for apidoc av_clear |
| 380 | |
| 381 | Clears an array, making it empty. Does not free the memory used by the |
| 382 | array itself. |
| 383 | |
| 384 | =cut |
| 385 | */ |
| 386 | |
| 387 | void |
| 388 | Perl_av_clear(pTHX_ register AV *av) |
| 389 | { |
| 390 | register I32 key; |
| 391 | SV** ary; |
| 392 | |
| 393 | #ifdef DEBUGGING |
| 394 | if (SvREFCNT(av) == 0 && ckWARN_d(WARN_DEBUGGING)) { |
| 395 | Perl_warner(aTHX_ WARN_DEBUGGING, "Attempt to clear deleted array"); |
| 396 | } |
| 397 | #endif |
| 398 | if (!av) |
| 399 | return; |
| 400 | /*SUPPRESS 560*/ |
| 401 | |
| 402 | if (SvREADONLY(av)) |
| 403 | Perl_croak(aTHX_ PL_no_modify); |
| 404 | |
| 405 | /* Give any tie a chance to cleanup first */ |
| 406 | if (SvRMAGICAL(av)) |
| 407 | mg_clear((SV*)av); |
| 408 | |
| 409 | if (AvMAX(av) < 0) |
| 410 | return; |
| 411 | |
| 412 | if (AvREAL(av)) { |
| 413 | ary = AvARRAY(av); |
| 414 | key = AvFILLp(av) + 1; |
| 415 | while (key) { |
| 416 | SvREFCNT_dec(ary[--key]); |
| 417 | ary[key] = &PL_sv_undef; |
| 418 | } |
| 419 | } |
| 420 | if ((key = AvARRAY(av) - AvALLOC(av))) { |
| 421 | AvMAX(av) += key; |
| 422 | SvPVX(av) = (char*)AvALLOC(av); |
| 423 | } |
| 424 | AvFILLp(av) = -1; |
| 425 | |
| 426 | } |
| 427 | |
| 428 | /* |
| 429 | =for apidoc av_undef |
| 430 | |
| 431 | Undefines the array. Frees the memory used by the array itself. |
| 432 | |
| 433 | =cut |
| 434 | */ |
| 435 | |
| 436 | void |
| 437 | Perl_av_undef(pTHX_ register AV *av) |
| 438 | { |
| 439 | register I32 key; |
| 440 | |
| 441 | if (!av) |
| 442 | return; |
| 443 | /*SUPPRESS 560*/ |
| 444 | |
| 445 | /* Give any tie a chance to cleanup first */ |
| 446 | if (SvTIED_mg((SV*)av, 'P')) |
| 447 | av_fill(av, -1); /* mg_clear() ? */ |
| 448 | |
| 449 | if (AvREAL(av)) { |
| 450 | key = AvFILLp(av) + 1; |
| 451 | while (key) |
| 452 | SvREFCNT_dec(AvARRAY(av)[--key]); |
| 453 | } |
| 454 | Safefree(AvALLOC(av)); |
| 455 | AvALLOC(av) = 0; |
| 456 | SvPVX(av) = 0; |
| 457 | AvMAX(av) = AvFILLp(av) = -1; |
| 458 | if (AvARYLEN(av)) { |
| 459 | SvREFCNT_dec(AvARYLEN(av)); |
| 460 | AvARYLEN(av) = 0; |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | /* |
| 465 | =for apidoc av_push |
| 466 | |
| 467 | Pushes an SV onto the end of the array. The array will grow automatically |
| 468 | to accommodate the addition. |
| 469 | |
| 470 | =cut |
| 471 | */ |
| 472 | |
| 473 | void |
| 474 | Perl_av_push(pTHX_ register AV *av, SV *val) |
| 475 | { |
| 476 | MAGIC *mg; |
| 477 | if (!av) |
| 478 | return; |
| 479 | if (SvREADONLY(av)) |
| 480 | Perl_croak(aTHX_ PL_no_modify); |
| 481 | |
| 482 | if ((mg = SvTIED_mg((SV*)av, 'P'))) { |
| 483 | dSP; |
| 484 | PUSHSTACKi(PERLSI_MAGIC); |
| 485 | PUSHMARK(SP); |
| 486 | EXTEND(SP,2); |
| 487 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 488 | PUSHs(val); |
| 489 | PUTBACK; |
| 490 | ENTER; |
| 491 | call_method("PUSH", G_SCALAR|G_DISCARD); |
| 492 | LEAVE; |
| 493 | POPSTACK; |
| 494 | return; |
| 495 | } |
| 496 | av_store(av,AvFILLp(av)+1,val); |
| 497 | } |
| 498 | |
| 499 | /* |
| 500 | =for apidoc av_pop |
| 501 | |
| 502 | Pops an SV off the end of the array. Returns C<&PL_sv_undef> if the array |
| 503 | is empty. |
| 504 | |
| 505 | =cut |
| 506 | */ |
| 507 | |
| 508 | SV * |
| 509 | Perl_av_pop(pTHX_ register AV *av) |
| 510 | { |
| 511 | SV *retval; |
| 512 | MAGIC* mg; |
| 513 | |
| 514 | if (!av || AvFILL(av) < 0) |
| 515 | return &PL_sv_undef; |
| 516 | if (SvREADONLY(av)) |
| 517 | Perl_croak(aTHX_ PL_no_modify); |
| 518 | if ((mg = SvTIED_mg((SV*)av, 'P'))) { |
| 519 | dSP; |
| 520 | PUSHSTACKi(PERLSI_MAGIC); |
| 521 | PUSHMARK(SP); |
| 522 | XPUSHs(SvTIED_obj((SV*)av, mg)); |
| 523 | PUTBACK; |
| 524 | ENTER; |
| 525 | if (call_method("POP", G_SCALAR)) { |
| 526 | retval = newSVsv(*PL_stack_sp--); |
| 527 | } else { |
| 528 | retval = &PL_sv_undef; |
| 529 | } |
| 530 | LEAVE; |
| 531 | POPSTACK; |
| 532 | return retval; |
| 533 | } |
| 534 | retval = AvARRAY(av)[AvFILLp(av)]; |
| 535 | AvARRAY(av)[AvFILLp(av)--] = &PL_sv_undef; |
| 536 | if (SvSMAGICAL(av)) |
| 537 | mg_set((SV*)av); |
| 538 | return retval; |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | =for apidoc av_unshift |
| 543 | |
| 544 | Unshift the given number of C<undef> values onto the beginning of the |
| 545 | array. The array will grow automatically to accommodate the addition. You |
| 546 | must then use C<av_store> to assign values to these new elements. |
| 547 | |
| 548 | =cut |
| 549 | */ |
| 550 | |
| 551 | void |
| 552 | Perl_av_unshift(pTHX_ register AV *av, register I32 num) |
| 553 | { |
| 554 | register I32 i; |
| 555 | register SV **ary; |
| 556 | MAGIC* mg; |
| 557 | |
| 558 | if (!av || num <= 0) |
| 559 | return; |
| 560 | if (SvREADONLY(av)) |
| 561 | Perl_croak(aTHX_ PL_no_modify); |
| 562 | |
| 563 | if ((mg = SvTIED_mg((SV*)av, 'P'))) { |
| 564 | dSP; |
| 565 | PUSHSTACKi(PERLSI_MAGIC); |
| 566 | PUSHMARK(SP); |
| 567 | EXTEND(SP,1+num); |
| 568 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 569 | while (num-- > 0) { |
| 570 | PUSHs(&PL_sv_undef); |
| 571 | } |
| 572 | PUTBACK; |
| 573 | ENTER; |
| 574 | call_method("UNSHIFT", G_SCALAR|G_DISCARD); |
| 575 | LEAVE; |
| 576 | POPSTACK; |
| 577 | return; |
| 578 | } |
| 579 | |
| 580 | if (!AvREAL(av) && AvREIFY(av)) |
| 581 | av_reify(av); |
| 582 | i = AvARRAY(av) - AvALLOC(av); |
| 583 | if (i) { |
| 584 | if (i > num) |
| 585 | i = num; |
| 586 | num -= i; |
| 587 | |
| 588 | AvMAX(av) += i; |
| 589 | AvFILLp(av) += i; |
| 590 | SvPVX(av) = (char*)(AvARRAY(av) - i); |
| 591 | } |
| 592 | if (num) { |
| 593 | i = AvFILLp(av); |
| 594 | av_extend(av, i + num); |
| 595 | AvFILLp(av) += num; |
| 596 | ary = AvARRAY(av); |
| 597 | Move(ary, ary + num, i + 1, SV*); |
| 598 | do { |
| 599 | ary[--num] = &PL_sv_undef; |
| 600 | } while (num); |
| 601 | } |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | =for apidoc av_shift |
| 606 | |
| 607 | Shifts an SV off the beginning of the array. |
| 608 | |
| 609 | =cut |
| 610 | */ |
| 611 | |
| 612 | SV * |
| 613 | Perl_av_shift(pTHX_ register AV *av) |
| 614 | { |
| 615 | SV *retval; |
| 616 | MAGIC* mg; |
| 617 | |
| 618 | if (!av || AvFILL(av) < 0) |
| 619 | return &PL_sv_undef; |
| 620 | if (SvREADONLY(av)) |
| 621 | Perl_croak(aTHX_ PL_no_modify); |
| 622 | if ((mg = SvTIED_mg((SV*)av, 'P'))) { |
| 623 | dSP; |
| 624 | PUSHSTACKi(PERLSI_MAGIC); |
| 625 | PUSHMARK(SP); |
| 626 | XPUSHs(SvTIED_obj((SV*)av, mg)); |
| 627 | PUTBACK; |
| 628 | ENTER; |
| 629 | if (call_method("SHIFT", G_SCALAR)) { |
| 630 | retval = newSVsv(*PL_stack_sp--); |
| 631 | } else { |
| 632 | retval = &PL_sv_undef; |
| 633 | } |
| 634 | LEAVE; |
| 635 | POPSTACK; |
| 636 | return retval; |
| 637 | } |
| 638 | retval = *AvARRAY(av); |
| 639 | if (AvREAL(av)) |
| 640 | *AvARRAY(av) = &PL_sv_undef; |
| 641 | SvPVX(av) = (char*)(AvARRAY(av) + 1); |
| 642 | AvMAX(av)--; |
| 643 | AvFILLp(av)--; |
| 644 | if (SvSMAGICAL(av)) |
| 645 | mg_set((SV*)av); |
| 646 | return retval; |
| 647 | } |
| 648 | |
| 649 | /* |
| 650 | =for apidoc av_len |
| 651 | |
| 652 | Returns the highest index in the array. Returns -1 if the array is |
| 653 | empty. |
| 654 | |
| 655 | =cut |
| 656 | */ |
| 657 | |
| 658 | I32 |
| 659 | Perl_av_len(pTHX_ register AV *av) |
| 660 | { |
| 661 | return AvFILL(av); |
| 662 | } |
| 663 | |
| 664 | void |
| 665 | Perl_av_fill(pTHX_ register AV *av, I32 fill) |
| 666 | { |
| 667 | MAGIC *mg; |
| 668 | if (!av) |
| 669 | Perl_croak(aTHX_ "panic: null array"); |
| 670 | if (fill < 0) |
| 671 | fill = -1; |
| 672 | if ((mg = SvTIED_mg((SV*)av, 'P'))) { |
| 673 | dSP; |
| 674 | ENTER; |
| 675 | SAVETMPS; |
| 676 | PUSHSTACKi(PERLSI_MAGIC); |
| 677 | PUSHMARK(SP); |
| 678 | EXTEND(SP,2); |
| 679 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 680 | PUSHs(sv_2mortal(newSViv(fill+1))); |
| 681 | PUTBACK; |
| 682 | call_method("STORESIZE", G_SCALAR|G_DISCARD); |
| 683 | POPSTACK; |
| 684 | FREETMPS; |
| 685 | LEAVE; |
| 686 | return; |
| 687 | } |
| 688 | if (fill <= AvMAX(av)) { |
| 689 | I32 key = AvFILLp(av); |
| 690 | SV** ary = AvARRAY(av); |
| 691 | |
| 692 | if (AvREAL(av)) { |
| 693 | while (key > fill) { |
| 694 | SvREFCNT_dec(ary[key]); |
| 695 | ary[key--] = &PL_sv_undef; |
| 696 | } |
| 697 | } |
| 698 | else { |
| 699 | while (key < fill) |
| 700 | ary[++key] = &PL_sv_undef; |
| 701 | } |
| 702 | |
| 703 | AvFILLp(av) = fill; |
| 704 | if (SvSMAGICAL(av)) |
| 705 | mg_set((SV*)av); |
| 706 | } |
| 707 | else |
| 708 | (void)av_store(av,fill,&PL_sv_undef); |
| 709 | } |
| 710 | |
| 711 | SV * |
| 712 | Perl_av_delete(pTHX_ AV *av, I32 key, I32 flags) |
| 713 | { |
| 714 | SV *sv; |
| 715 | |
| 716 | if (!av) |
| 717 | return Nullsv; |
| 718 | if (SvREADONLY(av)) |
| 719 | Perl_croak(aTHX_ PL_no_modify); |
| 720 | if (key < 0) { |
| 721 | key += AvFILL(av) + 1; |
| 722 | if (key < 0) |
| 723 | return Nullsv; |
| 724 | } |
| 725 | if (SvRMAGICAL(av)) { |
| 726 | SV **svp; |
| 727 | if ((mg_find((SV*)av,'P') || mg_find((SV*)av,'D')) |
| 728 | && (svp = av_fetch(av, key, TRUE))) |
| 729 | { |
| 730 | sv = *svp; |
| 731 | mg_clear(sv); |
| 732 | if (mg_find(sv, 'p')) { |
| 733 | sv_unmagic(sv, 'p'); /* No longer an element */ |
| 734 | return sv; |
| 735 | } |
| 736 | return Nullsv; /* element cannot be deleted */ |
| 737 | } |
| 738 | } |
| 739 | if (key > AvFILLp(av)) |
| 740 | return Nullsv; |
| 741 | else { |
| 742 | sv = AvARRAY(av)[key]; |
| 743 | if (key == AvFILLp(av)) { |
| 744 | do { |
| 745 | AvFILLp(av)--; |
| 746 | } while (--key >= 0 && AvARRAY(av)[key] == &PL_sv_undef); |
| 747 | } |
| 748 | else |
| 749 | AvARRAY(av)[key] = &PL_sv_undef; |
| 750 | if (SvSMAGICAL(av)) |
| 751 | mg_set((SV*)av); |
| 752 | } |
| 753 | if (flags & G_DISCARD) { |
| 754 | SvREFCNT_dec(sv); |
| 755 | sv = Nullsv; |
| 756 | } |
| 757 | return sv; |
| 758 | } |
| 759 | |
| 760 | /* |
| 761 | * This relies on the fact that uninitialized array elements |
| 762 | * are set to &PL_sv_undef. |
| 763 | */ |
| 764 | |
| 765 | bool |
| 766 | Perl_av_exists(pTHX_ AV *av, I32 key) |
| 767 | { |
| 768 | if (!av) |
| 769 | return FALSE; |
| 770 | if (key < 0) { |
| 771 | key += AvFILL(av) + 1; |
| 772 | if (key < 0) |
| 773 | return FALSE; |
| 774 | } |
| 775 | if (SvRMAGICAL(av)) { |
| 776 | if (mg_find((SV*)av,'P') || mg_find((SV*)av,'D')) { |
| 777 | SV *sv = sv_newmortal(); |
| 778 | mg_copy((SV*)av, sv, 0, key); |
| 779 | magic_existspack(sv, mg_find(sv, 'p')); |
| 780 | return SvTRUE(sv); |
| 781 | } |
| 782 | } |
| 783 | if (key <= AvFILLp(av) && AvARRAY(av)[key] != &PL_sv_undef |
| 784 | && AvARRAY(av)[key]) |
| 785 | { |
| 786 | return TRUE; |
| 787 | } |
| 788 | else |
| 789 | return FALSE; |
| 790 | } |
| 791 | |
| 792 | /* AVHV: Support for treating arrays as if they were hashes. The |
| 793 | * first element of the array should be a hash reference that maps |
| 794 | * hash keys to array indices. |
| 795 | */ |
| 796 | |
| 797 | STATIC I32 |
| 798 | S_avhv_index_sv(pTHX_ SV* sv) |
| 799 | { |
| 800 | I32 index = SvIV(sv); |
| 801 | if (index < 1) |
| 802 | Perl_croak(aTHX_ "Bad index while coercing array into hash"); |
| 803 | return index; |
| 804 | } |
| 805 | |
| 806 | STATIC I32 |
| 807 | S_avhv_index(pTHX_ AV *av, SV *keysv, U32 hash) |
| 808 | { |
| 809 | HV *keys; |
| 810 | HE *he; |
| 811 | STRLEN n_a; |
| 812 | |
| 813 | keys = avhv_keys(av); |
| 814 | he = hv_fetch_ent(keys, keysv, FALSE, hash); |
| 815 | if (!he) |
| 816 | Perl_croak(aTHX_ "No such pseudo-hash field \"%s\"", SvPV(keysv,n_a)); |
| 817 | return avhv_index_sv(HeVAL(he)); |
| 818 | } |
| 819 | |
| 820 | HV* |
| 821 | Perl_avhv_keys(pTHX_ AV *av) |
| 822 | { |
| 823 | SV **keysp = av_fetch(av, 0, FALSE); |
| 824 | if (keysp) { |
| 825 | SV *sv = *keysp; |
| 826 | if (SvGMAGICAL(sv)) |
| 827 | mg_get(sv); |
| 828 | if (SvROK(sv)) { |
| 829 | sv = SvRV(sv); |
| 830 | if (SvTYPE(sv) == SVt_PVHV) |
| 831 | return (HV*)sv; |
| 832 | } |
| 833 | } |
| 834 | Perl_croak(aTHX_ "Can't coerce array into hash"); |
| 835 | return Nullhv; |
| 836 | } |
| 837 | |
| 838 | SV** |
| 839 | Perl_avhv_store_ent(pTHX_ AV *av, SV *keysv, SV *val, U32 hash) |
| 840 | { |
| 841 | return av_store(av, avhv_index(av, keysv, hash), val); |
| 842 | } |
| 843 | |
| 844 | SV** |
| 845 | Perl_avhv_fetch_ent(pTHX_ AV *av, SV *keysv, I32 lval, U32 hash) |
| 846 | { |
| 847 | return av_fetch(av, avhv_index(av, keysv, hash), lval); |
| 848 | } |
| 849 | |
| 850 | SV * |
| 851 | Perl_avhv_delete_ent(pTHX_ AV *av, SV *keysv, I32 flags, U32 hash) |
| 852 | { |
| 853 | HV *keys = avhv_keys(av); |
| 854 | HE *he; |
| 855 | |
| 856 | he = hv_fetch_ent(keys, keysv, FALSE, hash); |
| 857 | if (!he || !SvOK(HeVAL(he))) |
| 858 | return Nullsv; |
| 859 | |
| 860 | return av_delete(av, avhv_index_sv(HeVAL(he)), flags); |
| 861 | } |
| 862 | |
| 863 | /* Check for the existence of an element named by a given key. |
| 864 | * |
| 865 | */ |
| 866 | bool |
| 867 | Perl_avhv_exists_ent(pTHX_ AV *av, SV *keysv, U32 hash) |
| 868 | { |
| 869 | HV *keys = avhv_keys(av); |
| 870 | HE *he; |
| 871 | |
| 872 | he = hv_fetch_ent(keys, keysv, FALSE, hash); |
| 873 | if (!he || !SvOK(HeVAL(he))) |
| 874 | return FALSE; |
| 875 | |
| 876 | return av_exists(av, avhv_index_sv(HeVAL(he))); |
| 877 | } |
| 878 | |
| 879 | HE * |
| 880 | Perl_avhv_iternext(pTHX_ AV *av) |
| 881 | { |
| 882 | HV *keys = avhv_keys(av); |
| 883 | return hv_iternext(keys); |
| 884 | } |
| 885 | |
| 886 | SV * |
| 887 | Perl_avhv_iterval(pTHX_ AV *av, register HE *entry) |
| 888 | { |
| 889 | SV *sv = hv_iterval(avhv_keys(av), entry); |
| 890 | return *av_fetch(av, avhv_index_sv(sv), TRUE); |
| 891 | } |